前后光栅周期对于双光栅结构薄膜太阳能电池光俘获效应的影响

发布时间：2018-04-11 05:01

  本文选题：薄膜太阳能电池 + 光俘获　； 参考：《物理学报》2014年19期

【摘要】：本文用时域有限差分法对硅层等效厚度为100 nm的具有不同前后光栅周期的介质/金属双光栅结构薄膜太阳能电池进行了模拟分析,比较了三角形最佳相同与不同周期光栅结构的吸收光谱特性,分析了光栅高度、填充比、硅吸收层厚度对最佳相同和不同周期光栅结构光吸收特性的影响,以及相应结构中导致光吸收增强的共振模式.结果表明前后光栅周期为1:1的共形双光栅结构中存在光泄漏现象,偏离1:1后的光栅结构可有效地抑制低级次衍射光的泄漏,前光栅周期小于后光栅周期的结构光吸收性能的提高来自于平面波导模式在吸收层中的有效激发和传播,而前光栅周期大于后光栅周期的结构光吸收性能的提高则来自于后光栅界面上所激发的等离子体极化模式.在较厚的硅吸收层厚度,前后光栅周期比为1:2和1:3的电池结构也会出现光泄漏现象,从而使具有最大光吸收效率的结构偏离这些周期比结构的位置.
[Abstract]:In this paper, the thin-film solar cells with the dielectric / metal double grating structure with 100 nm equivalent thickness of silicon layer with different periods before and after the grating are simulated and analyzed by using the finite-difference time-domain method (FDTD).In this paper, the absorption spectrum characteristics of the same and different period gratings are compared, and the effects of grating height, filling ratio and the thickness of silicon absorption layer on the optical absorption characteristics of the same and different period gratings are analyzed.And the resonant modes in the corresponding structures which lead to the enhancement of optical absorption.The results show that there is a phenomenon of light leakage in conformal double grating structures with a period of 1:1 before and after the grating. The grating structure deviating from 1:1 can effectively suppress the leakage of lower order diffraction light.The improvement of the absorption performance of the structure light with the period of the front grating being smaller than the period of the latter comes from the effective excitation and propagation of the planar waveguide mode in the absorption layer.The enhancement of the absorption performance of the structure light with the period of the front grating is larger than the period of the post grating is due to the plasma polarization mode excited at the interface of the post grating.When the thickness of silicon absorption layer is thicker, the structure of the cell with the period ratio of 1:2 and 1:3 will also appear the phenomenon of light leakage, which makes the structure with the maximum optical absorption efficiency deviate from the position of these periodic ratio structures.
【作者单位】： 同济大学物理科学与工程学院;
【基金】：国家自然科学基金(批准号:60977028) 上海重点科研项目基金(批准号:09JC1413800)资助的课题~~
【分类号】：TN253;TM914.42
，

本文编号：1734514